python replace space with special characters between strings

Question

I would like to replace all spaces between strings with '#' except for the space after the end of string.

Example:

input=' hello  world    '
output = '#hello##world'

I know using rstrip() I can neglect the space at the end of string . I just want to try without using rstrip()

Answer 1

Use regular expressions.

import re
a = ' hello  world    '
a = re.sub(' +$', '', a)
output = re.sub(' ', '#', a)

but really, this is better:

output = re.sub(' ', '#', a.rstrip())